[dpdk-dev] [PATCH v2 28/29] net/mlx4: disable UDP support in RSS flow rules

Adrien Mazarguil adrien.mazarguil at 6wind.com
Thu Oct 12 14:19:42 CEST 2017


When part of the RSS hash calculation, UDP packets are discarded (not
received on any queue) likely due to an issue with the kernel
implementation.

Temporarily disable UDP RSS support until this issue is resolved.

Signed-off-by: Adrien Mazarguil <adrien.mazarguil at 6wind.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro at 6wind.com>
---
 drivers/net/mlx4/mlx4_flow.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx4/mlx4_flow.c b/drivers/net/mlx4/mlx4_flow.c
index 2b60d76..4c498f0 100644
--- a/drivers/net/mlx4/mlx4_flow.c
+++ b/drivers/net/mlx4/mlx4_flow.c
@@ -133,9 +133,11 @@ mlx4_conv_rss_hf(uint64_t rss_hf)
 		[TCP] = (ETH_RSS_NONFRAG_IPV4_TCP |
 			 ETH_RSS_NONFRAG_IPV6_TCP |
 			 ETH_RSS_IPV6_TCP_EX),
-		[UDP] = (ETH_RSS_NONFRAG_IPV4_UDP |
-			 ETH_RSS_NONFRAG_IPV6_UDP |
-			 ETH_RSS_IPV6_UDP_EX),
+		/*
+		 * UDP support is temporarily disabled due to an
+		 * implementation issue in the kernel.
+		 */
+		[UDP] = 0,
 	};
 	const uint64_t out[RTE_DIM(in)] = {
 		[IPV4] = IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4,
@@ -753,10 +755,8 @@ mlx4_flow_prepare(struct priv *priv,
 					.rss_key = mlx4_rss_hash_key_default,
 					.rss_key_len = MLX4_RSS_HASH_KEY_SIZE,
 					.rss_hf = (ETH_RSS_IPV4 |
-						   ETH_RSS_NONFRAG_IPV4_UDP |
 						   ETH_RSS_NONFRAG_IPV4_TCP |
 						   ETH_RSS_IPV6 |
-						   ETH_RSS_NONFRAG_IPV6_UDP |
 						   ETH_RSS_NONFRAG_IPV6_TCP),
 				};
 			/* Sanity checks. */
-- 
2.1.4



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